Can anyone help on this question

[bluesclue]

1.\tFind out the relationship of the figure. The distance between the boy and the heli is the hypotenuse. For right angled triangle, the 3 sides are related by sum of squares of the two short sides –> ……… theorem


2.\tGiven one side is changing at 25m/s , make this side x, and rate of change of x, dx/dt =25 m/s

3.\tGiven another side is constant, so the 3rd side is…. y= f(x)=theorem from step 1. find dy/dx

4.\tUsing chain differentiation, rate of change of y, dy/dt= dy/dx. dx/dt

5.\tpost back if you still need more clues.

[bluesky63]

Hi,


Can explain more on how to form the y = f(x)? Thanks !

[bluesclue]

http://i59.tinypic.com/2mfalqf.png\">

[bluesky63]

Hi bluesclue,


what is the x value to sub in dy/dx ? thanks

[pinkapple]

bluesky63:

Hi bluesclue,


what is the x value to sub in dy/dx ? thanks

X is the horizontal distance so x = 72 add required by question

[bluesky63]

pinkapple:

bluesky63:

Hi bluesclue,


what is the x value to sub in dy/dx ? thanks

X is the horizontal distance so x = 72 add required by question

Thanks a lot... Got it !